Relative vs Global Mouse Coordinates

1#include <SDL.h>
2#include <iostream>
3
4int main(int argc, char** argv) {
5  SDL_Init(SDL_INIT_VIDEO);
6  SDL_Window* window =
7    SDL_CreateWindow("Relative Coordinates",
8                     SDL_WINDOWPOS_CENTERED,
9                     SDL_WINDOWPOS_CENTERED,
10                     800, 600,
11                     SDL_WINDOW_SHOWN);
12
13  bool running = true;
14  while (running) {
15    SDL_Event event;
16    while (SDL_PollEvent(&event)) {
17      if (event.type == SDL_QUIT) {
18        running = false;
19      }
20    }
21
22    int x, y;
23    SDL_GetMouseState(&x, &y); 
24
25    // Check if mouse is in top-left quadrant
26    if (x < 400 && y < 300) {
27      std::cout <<
28        "Mouse in top-left quadrant at "
29        << x << "," << y << "\n";
30    }
31  }
32
33  SDL_DestroyWindow(window);
34  SDL_Quit();
35  return 0;
36}

1#include <SDL.h>
2#include <iostream>
3
4int main(int argc, char** argv) {
5  SDL_Init(SDL_INIT_VIDEO);
6
7  // Create two windows side by side
8  SDL_Window* window1 =
9    SDL_CreateWindow("Window 1", 100, 100, 400,
10                     300, SDL_WINDOW_SHOWN);
11  SDL_Window* window2 =
12    SDL_CreateWindow("Window 2", 550, 100, 400,
13                     300, SDL_WINDOW_SHOWN);
14
15  bool running = true;
16  while (running) {
17    SDL_Event event;
18    while (SDL_PollEvent(&event)) {
19      if (event.type == SDL_QUIT) {
20        running = false;
21      }
22    }
23
24    int globalX, globalY;
25    SDL_GetGlobalMouseState(&globalX, &globalY);
26
27    std::cout << "Mouse at global position: "
28      << globalX << "," << globalY << "\n";
29  }
30
31  SDL_DestroyWindow(window1);
32  SDL_DestroyWindow(window2);
33  SDL_Quit();
34  return 0;
35}